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T-Rex was developed by an international team led by the Kanagawa Institute of Technology/Nihon University to test a new type of electrodynamic tether (EDT) that may lead to a generation of propellantless propulsion systems for LEO spacecraft.

10 years after YES, the successor, the Young Engineers' Satellite 2 (YES2) was flown. The YES2 was a 36 kg student-built tether satellite part of ESA's Foton-M3 microgravity mission. The YES2 satellite employed a 32 km long tether to deorbit a small re-entry capsule "Fotino."

Applicability of Tether Deployment Simulation and Tests based on YES2 Flight Data

A typical landing area from MTBSim tether/re-entry Monte Carlo simulations

This project involved comparison of tether deployment data from the second Young Engineers’ Satellite (YES2) experiment to advanced simulator and ground test results, in order to draw more general conclusions about the predictive value of ground-based preparation for space tether missions.

In 1997, the European Space Agency launched the Young Engineers' Satellite (YES) of about 200 kg into GTO with a 35 km double-strand tether, and planned to deorbit a probe at near-interplanetary speed by swinging deployment of the tether system.